The Navy designed this lethal one-man turret in World War II

When you think about turrets, you likely think about the big ones. Like those on Iowa-class battleships that hold three 16-inch guns, or even the twin five-inch mounts found on cruisers, destroyers, and carriers. Well, in this case, you'd be thinking too big.

Toward the end of World War II, the Navy was deploying a unique turret meant for the legendary PT boats. The purpose was to make them even more lethal than they proved to be in the Philippines and the Solomons.

This version of the Elco Thunderbolt had four 20mm Oerlikon cannon and two M2 heavy machine guns. (U.S. Navy photo)

PT boats had become more than just a means of torpedoing enemy ships. By the end of the Solomons campaign, they were being used to attack barges — not with torpedoes, but with a lot of gunfire. Field modifications soon gave PT boats more powerful weapons, but there was a problem: PT boats didn't have a ton of space.

This early Thunderbolt had six M2 heavy machine guns and two 20mm Oerlikon cannon. (Photo from National Archives)

The solution to that problem was an electric turret called the Elco Thunderbolt. Elco was one of two companies that made the fast and lethal PT boats (the other was Higgins — yes, the makers of a crucial landing craft made PT boats as well). In addition to making PT boats even more lethal, this new turret would help a number of ships add firepower and reduce manpower.

A PT boat off New Guinea. Operations in the Solomons lead to a push for more firepower. (U.S. Navy photo)

One early version of this turret featured two Oerlikon 20mm cannon and six M2 heavy machine guns. Other mixes were tested, including four Oerlikon cannon and two M2s or just the four Oerlikons. No matter the loadout, though, these turrets only required one person to send a huge wall of lead at an incoming enemy.

By the time the war ended, the turret found its onto PT boats and some of the older battleships. Afterwards, it faded into history. Today, the Navy uses somewhat similar mounts for the Mk 38 Bushmaster, a 25mm chain gun. Still, the Thunderbolt showed some very interesting possibilities during its brief, but potent lifespan.